CN110666299A - 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method - Google Patents
810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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Abstract
The invention discloses a 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method, which belongs to the field of welding of large-span, heavy-load, high-strength, high-toughness and high-weather-resistant bridge steel, and adopts the technical scheme that a base material with tensile strength larger than or equal to 810MPa is adopted as a groove, an X-shaped asymmetric groove is adopted as the groove, the deep groove side groove angle is 60 degrees, the shallow groove side groove angle is 65 degrees, and the blunt edge is 2 mm; and the deep groove side firstly adopts gas shielded welding to prime two layers, then the cover surface is filled by submerged automatic arc welding, and the groove angle is increased on the shallow groove side to directly fill the cover surface by submerged automatic arc welding. The invention adopts a butt joint composite welding method of different thick plates to solve the problem that the cracking and breaking of a large-scale steel structure in the welding process cannot be ensured under the condition of no heat treatment after welding; the angle of the side groove of the shallow groove is 65 degrees, so that the back chipping workload of the large-angle groove is reduced, and the slag removal of the welding flux is facilitated while the operability is ensured.
Description
Technical Field
The invention relates to the technical field of welding of large-span, heavy-load, high-strength, high-toughness and high-weather-resistance bridge steel, in particular to a 810 MPa-grade high-performance weather-resistance bridge steel composite welding butt joint method.
Background
The seven bridge in Jianghhan proposed in China is a bidirectional 6-lane highway bridge, and the main bridge of the seven bridge is a heavy-load highway bridge with the span of 408 meters. In order to meet the requirement of high strength, large span, heavy load and high speed development of bridge construction in China, BaoWu group develops a new generation of high strength, high toughness and high weather resistance bridge steel Q690qENH for the bridge in China, the comprehensive mechanical property of the steel reaches the level of foreign similar steel types, and particularly, the low-temperature impact toughness and the weather resistance are greatly improved while the strength is improved. The improvement of the performance of the base material puts urgent demands on the welding material and the welding process matched with the base material. Therefore, if the problems of weldability, matching welding materials and welding process of the high-performance weather-resistant bridge steel are not solved timely and effectively, the popularization and application of the bridge steel and new steel types in China are directly hindered. The method accelerates the development of the welding process of the steel for the large-span and heavy-load bridge and the research of the matched welding materials, and has great economic benefit and social benefit for the popularization and the application of the steel for the bridge in the manufacturing technology of the large-span, heavy-load and high-weather-resistance thick plate bridge structure in China.
The document of Chinese patent No. CN201210287003.9, the disclosure of whichA composite welding method for LYR690 steel with high strength and low yield ratio is provided. The tensile strength Rm is more than or equal to 690MPa, the yield strength ReL is more than or equal to 500MPa, the yield ratio is 0.70-0.71, the elongation A is more than or equal to 18%, and the impact energy KV at minus 40 DEG C2LYR690 steel of 120J or more; the thickness of the welding rod is 40mm, and the welding rod is in combined butt-joint composite welding with the same plate thickness; the composite welding groove adopts a double-sided asymmetric X groove, the angle of the groove is 60 degrees, and the truncated edge is 1 mm; the tensile strength of the matched welding wires is more than or equal to 700 MPa; firstly, argon-rich gas shielded welding is adopted to carry out 6-7 times of continuous welding on the front side and the back side of the double-sided asymmetric groove respectively, the welding current is 265-270A, the welding voltage is 27-28V, the welding speed is 29-28 cm/min, the welding line energy is 15-16 kJ/cm, the argon-rich gas flow is 18-19L/min, then submerged arc welding is adopted, 4-5 times of continuous welding are carried out on the front side and the back side respectively until the welding line is filled, the diameter of a submerged arc welding wire is phi 4.0mm, the welding current is 550-560A, the welding voltage is 31V, the welding speed is 35cm/min, and the welding line energy is 29-30 kJ/cm; the interlayer temperature is controlled to be 120-150 ℃. The document has the following defects: it adopts full-automatic CO of groove angle2The combined welding process of gas shielded welding and submerged arc automatic welding, however, when submerged arc welding is carried out, the welding flux is difficult to deslag, and the welding seam is difficult to form.
Therefore, a 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method is provided.
Disclosure of Invention
The invention mainly aims to provide a 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method to solve the problems in the background technology.
In order to achieve the purpose, the invention provides a 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method, which comprises the following steps:
1) the bridge steel with the tensile strength of more than or equal to 810MPa is adopted, and the mechanical property characteristics are as follows: the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40 DEG C2≥120J；
2) The groove adopts an X-shaped asymmetric groove, the angle of the deep groove side is 60 degrees, the angle of the shallow groove side is 65 degrees, the truncated edge is 2mm, and no gap exists;
3) assembling by using a stacking plate, and adopting a welding method of gouging back by using an air gouging and melting through;
4) the welding process comprises the following steps:
a) two layers of joints with deep groove sides at the bottom are formed, the shallow groove sides are subjected to gas gouging and back chipping and then are subjected to submerged arc automatic welding, the interlayer temperature is controlled to be 120-150 ℃, the welding current of the gas shielded welding is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20% CO is adopted in volume percentage2Argon-rich gas with 80% of Ar is used as protective gas, and the gas flow is controlled to be welded under the condition of 20-25L/min;
b) filling the cover surface by performing submerged arc automatic welding, controlling the interlayer temperature to be 120-150 ℃, matching with a preferred welding flux, and then ensuring that the tensile strength of deposited metal is more than 810MPa and the diameter phi of a welding wire is 4.0 mm;
wherein, the welding current of the submerged automatic arc welding is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm.
Further, the flux used for the submerged automatic arc welding is a sintered flux with a basicity of 3.0.
Furthermore, the tensile strength of the gas shielded welding wire is more than 810MPa, and the diameter of the welding wire is phi 1.2 mm.
The steel grade of the invention is improved from the prior Q370qE, Q420qE and Q500qE to Q690qE, the steel is preheated to 80-100 ℃ before welding, a heat treatment process is not carried out after welding, a large amount of welding materials selected by tests are adopted to match with welding process parameters, flaw detection is carried out, no welding defect is found, a welding joint has excellent low-temperature toughness, crack resistance and weather resistance, and KV at-40 ℃ in each area of the joint is carried out2The impact power reaches 140-255J, and is far higher than KV at 40 ℃ below zero in each area of the bridge steel butt joint2The welding performance standard is more than or equal to 47J, the joint has higher impact toughness reserve and safety margin, and the key technical requirement of manufacturing a large-span bridge steel structure can be completely met.
By applying the technical scheme of the invention, the beneficial effects are as follows:
(1) the groove adopts an X-shaped asymmetric groove, the angle of the deep groove side groove is 60 degrees, the angle of the shallow groove side groove is 65 degrees, the back chipping workload of the large-angle groove is reduced by the fact that the angle of the shallow groove side groove is 65 degrees, the operability is guaranteed, meanwhile, the welding flux is convenient to deslag, and the welding seam forming is guaranteed;
(2) the bridge steel composite welding butt joint method with high tensile strength of more than or equal to 810MPa, high toughness and high weather resistance meets the key welding process manufacturing technology of composite welding of the steel structure of seven bridges in Jianghan, which is proposed in China. The joint has excellent low-temperature toughness, crack resistance and weather resistance, and each area of the joint has higher impact toughness storage and safety margin;
(3) by adopting the welding process technology, the superheat zone of the joint is mainly a bainite structure, and the weld metal is mainly a fine acicular ferrite structure, so that the weld has excellent low-temperature impact toughness, and the joint has excellent crack resistance, weather resistance and excellent comprehensive mechanical properties;
(4) the gas shielded welding bottoming and submerged arc welding filling cover surface composite welding process technology realizes a welding process of preheating at 80-100 ℃ before welding in the manufacturing process of the high-strength bridge steel thick plate structure and not carrying out heat treatment after welding, and a joint has excellent crack resistance, weather resistance and comprehensive mechanical properties when multilayer and multi-channel continuous welding is adopted.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a 32mm +32mm joint groove structure diagram of a 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method;
FIG. 2 shows a structure diagram of a 50mm +50mm joint groove of a 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in figures 1 to 2, the invention provides a 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method, which comprises the following steps:
1) the bridge steel with the tensile strength of more than or equal to 810MPa is adopted, and the mechanical property characteristics are as follows: the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40 DEG C2≥120J；
2) The groove adopts an X-shaped asymmetric groove, the angle of the deep groove side is 60 degrees, the angle of the shallow groove side is 65 degrees, the truncated edge is 2mm, and no gap exists;
3) assembling by using a stacking plate, and adopting a welding method of gouging back by using an air gouging and melting through;
4) the welding process comprises the following steps:
a) two layers of joints with deep groove sides at the bottom are formed, the shallow groove sides are subjected to gas gouging and back chipping and then are subjected to submerged arc automatic welding, the interlayer temperature is controlled to be 120-150 ℃, the welding current of the gas shielded welding is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20% CO is adopted in volume percentage2Argon-rich gas with 80% of Ar is used as protective gas, and the gas flow is controlled to be welded under the condition of 20-25L/min;
b) filling the cover surface by performing submerged arc automatic welding, controlling the interlayer temperature to be 120-150 ℃, matching with a preferred welding flux, and then ensuring that the tensile strength of deposited metal is more than 810MPa and the diameter phi of a welding wire is 4.0 mm;
wherein, the welding current of the submerged automatic arc welding is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm.
Optionally, the tensile strength of the gas shielded welding wire is larger than 810MPa, and the diameter of the welding wire is phi 1.2 mm.
The technical scheme of the embodiment is applied and carried out according to the following specific steps:
s1, welding groove processing and cleaning, namely polishing and cleaning the two sides of the groove of the two butt-jointed steel plates after machining to expose the metallic luster; the groove is in an X-shaped groove, and the two steel plates form a deep groove with an angle of 60 degrees and a shallow groove with an angle of 65 degrees;
the angle of the side groove of the shallow groove is 65 degrees, so that the back chipping workload of the large-angle groove is reduced, the operability is ensured, meanwhile, the flux is convenient to deslag, and the welding seam forming is ensured.
S2, adopting solid welding wire argon-rich gas shielded welding for primingWelding layers; the solid welding wire adopts XY-ER80QNH and has the diameter phi of 1.2 mm; when the bottom layer is welded, the protective gas is 20 percent CO by volume percentage2The argon-rich gas with 80% of Ar, the gas flow is 25-28L/min, the direct current of a power supply is reversely connected, the welding current is 250A, the welding voltage is 28V, the welding speed is 30cm/min, and the energy of a welding line is 14 KJ/cm;
and S3, adopting submerged arc automatic welding for filling and surfacing, wherein XY-S80QNH welding wires are selected as submerged arc welding wires, the diameter phi of the welding wires is 4.0mm, and XY-AF85QNH welding flux is matched.
The welding flux used in the automatic submerged arc welding is sintered welding flux with alkalinity of 3.0. When the submerged arc automatic welding wire is matched with the welding flux to weld high-strength steel, an oxidation intermediate layer of the welding flux is easy to damage, a slag shell is brittle and cracked, and slag is convenient to remove.
Example 1
1) The base material steel grade is Q690qENH, the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40℃ is2Not less than 120J; equal-thickness bridge steel with the plate thickness combination of 32mm +32 mm;
the test panel size is 800mm multiplied by 300mm multiplied by 32 mm;
2) the bevel adopts a double-sided X-shaped asymmetric bevel, the bevel angle is 60-65 degrees, and the truncated edge is 2 mm;
matching welding materials:
the gas shielded welding wire for bottoming adopts XY-ER80QNH welding wire, the diameter of the welding wire is phi 1.2mm, and the argon-rich gas is shielded, and the argon-rich gas comprises 80% of Ar and 20% of CO2The deposited metal has mechanical properties of Rel 746MPa, Rm 833MPa, A17.5%, and KV at-40 deg.C2The impact work is 79J;
the submerged arc automatic welding adopts XY-S80QNH welding wire, the diameter of the welding wire is phi 4.0mm, XY-AF85QNH welding flux combination is matched, the mechanical property of deposited metal is Rel 770MPa, Rm 904MPa, A18.0 percent, and KV2 impact energy at minus 40 ℃ is 138J.
The welding process comprises the following steps:
a) the deep groove side is firstly welded and primed by gas shield welding, the welding current is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20 percent of CO by volume percentage is adopted2+ 80% Ar in an argon-rich atmosphere inThe flow rate is controlled to be 20L/min for welding;
b) and (4) performing submerged automatic arc welding to fill the cover surface, wherein the welding current is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm. The interlayer temperature is controlled at 150 ℃, the tensile strength of deposited metal is 833MPa after the interlayer temperature is matched with a welding flux, and the diameter of a welding wire is phi 4.0 mm;
the welding process is adopted to weld the mechanical properties of the 810 MPa-grade high-performance weather-resistant bridge steel butt joint, the tensile strength Rm of a welding seam is 821MPa, and the central impact energy of the welding seam is-40 ℃ KV2161J, heat affected zone (1mm) -40 KV2＝255J。
Example 2
1) The base material steel grade is Q690qENH, the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40℃ is2Not less than 120J; the plate thickness combination is 50mm +50mm of uniform thickness bridge steel;
the test plate size is 800mm multiplied by 300mm multiplied by 50 mm;
2) the bevel adopts a double-sided X-shaped asymmetric bevel, the bevel angle is 60-65 degrees, and the truncated edge is 2 mm;
matching welding materials: the gas shielded welding wire for bottoming adopts XY-ER80QNH welding wire, the diameter of the welding wire is phi 1.2mm, and the argon-rich gas is shielded, and the argon-rich gas comprises 80% of Ar and 20% of CO2The deposited metal has mechanical properties of Rel 746MPa, Rm 833MPa, A17.5%, and KV at-40 deg.C2The impact work is 79J;
the submerged arc automatic welding adopts XY-S80QNH welding wire, the diameter of the welding wire is phi 4.0mm, XY-AF85QNH welding flux combination is matched, the mechanical property of deposited metal is Rel 770MPa, Rm 904MPa, A18.0 percent, KV at minus 40 DEG C2The work of impact was 138J.
The welding process comprises the following steps:
a) the deep groove side is firstly welded and primed by gas shield welding, the welding current is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20 percent of CO by volume percentage is adopted2Argon-rich gas with 80% of Ar is used as protective gas, and welding is carried out under the condition that the flow rate is controlled at 20L/min;
b) and (4) performing submerged automatic arc welding to fill the cover surface, wherein the welding current is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm. The interlayer temperature is controlled at 150 ℃, the tensile strength of deposited metal is 833MPa after the interlayer temperature is matched with a welding flux, and the diameter of a welding wire is phi 4.0 mm;
the welding process is adopted to weld the mechanical properties of the 810 MPa-grade high-performance weather-resistant bridge steel butt joint, the tensile strength Rm of a welding seam is 915MPa, and the central impact energy of the welding seam is-40 ℃ KV2168J, heat affected zone (1mm) -40 KV2＝140J。
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method comprises the following steps:
1) the bridge steel with the tensile strength of more than or equal to 810MPa is adopted, and the mechanical property characteristics are as follows: the yield strength ReL is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 810MPa, the elongation A is more than or equal to 14 percent, and the impact energy KV at the temperature of minus 40 DEG C2≥120J；
2) The groove adopts an X-shaped asymmetric groove, the angle of the deep groove side is 60 degrees, the angle of the shallow groove side is 65 degrees, the truncated edge is 2mm, and no gap exists;
3) assembling by using a stacking plate, and adopting a welding method of gouging back by using an air gouging and melting through;
4) the welding process comprises the following steps:
a) two layers of joints with deep groove sides at the bottom are formed, the shallow groove sides are subjected to gas gouging and back chipping and then are subjected to submerged arc automatic welding, the interlayer temperature is controlled to be 120-150 ℃, the welding current of the gas shielded welding is 250A, the welding voltage is 28V, the welding speed is 30cm/min, the welding line energy is 14KJ/cm, and 20% CO is adopted in volume percentage2Argon-rich gas with 80% of Ar is used as protective gas, and the gas flow is controlled to be welded under the condition of 20-25L/min;
b) filling the cover surface by performing submerged arc automatic welding, controlling the interlayer temperature to be 120-150 ℃, matching with a preferred welding flux, and then ensuring that the tensile strength of deposited metal is more than 810MPa and the diameter phi of a welding wire is 4.0 mm;
wherein, the welding current of the submerged automatic arc welding is 650A, the welding voltage is 31V, the welding speed is 40cm/min, and the welding line energy is 30 KJ/cm.
2. The 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method according to claim 1, characterized in that: the flux used for submerged automatic arc welding is a sintered flux with a basicity of 3.0.
3. The 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method according to claim 1, characterized in that: the tensile strength of the gas shielded welding wire is more than 810MPa, and the diameter of the welding wire is phi 1.2 mm.
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